As for uploading the project, scratch users can download the files to their computer and then upload them to share. Since other users will need to load these files in scratch, this isn't ideal. However, this doesn't seem to require and account so unless a better method is found this doesn't seem too unfeasible.
Haven't had time to test this method personally, I'll need to look into it before listing it as a viable option. However, if you know this works then you can go for it.
